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Adding new shear walls to an existing frame will

  • A.reduce both the drift and the force the building attracts from the shaking
  • B.increase drift while reducing the force the building attracts from the shaking
  • C.leave the drift and the force of the building entirely unaltered
  • D.reduce drift but attract a larger force

Answer: D

Stiffening shortens the period and usually moves the building towards the plateau of the spectrum where the ordinate is largest. The walls take most of the increased force, so the existing frame may still be relieved, but the foundations under the new walls must be checked carefully.

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